US20210227592A1 - Base station configured hybrid random access procedure - Google Patents

Base station configured hybrid random access procedure Download PDF

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Publication number
US20210227592A1
US20210227592A1 US17/268,523 US201817268523A US2021227592A1 US 20210227592 A1 US20210227592 A1 US 20210227592A1 US 201817268523 A US201817268523 A US 201817268523A US 2021227592 A1 US2021227592 A1 US 2021227592A1
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mode
random access
access procedure
configuration
computer program
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Frank Frederiksen
Zhe Luo
Tao Tao
Jianguo Liu
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Nokia Technologies Oy
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Nokia Technologies Oy
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0825—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision detection

Definitions

  • the teachings in accordance with the exemplary embodiments of this invention relate generally to Radio Standards including physical layer (PHY), Medium access control (MAC), Radio Link Control (RLC), Radio Resource Control (RRC), etc., and particularly, to downlink control channel transmission and reception.
  • PHY physical layer
  • MAC Medium access control
  • RLC Radio Link Control
  • RRC Radio Resource Control
  • gNB 5G Enhanced Node B Base station
  • an example method comprises configuring, by a base station, a device with a first mode of performing random access procedure; configuring the device with a second mode of performing random access procedure, wherein the device is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and configuring an availability of the second mode of performing random access procedure.
  • an example apparatus comprises at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to: configure a device with a first mode of performing random access procedure; configure the device with a second mode of performing random access procedure, wherein the device is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and control an availability of the second mode of performing random access procedure.
  • an example apparatus comprises means for configuring a device with a first mode of performing random access procedure; means for configuring the device with a second mode of performing random access procedure, wherein the device is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and means for configuring an availability of the second mode of performing random access procedure.
  • FIG. 1 is a block diagram of one possible and non-limiting example system in which the example embodiments may be practiced;
  • FIG. 2 shows a method in accordance with example embodiments which may be performed by an apparatus
  • FIG. 3 shows a method in accordance with example embodiments which may be performed by an apparatus
  • FIG. 4 shows a method in accordance with example embodiments which may be performed by an apparatus
  • FIG. 5 shows another method in accordance with example embodiments which may be performed by an apparatus.
  • FIG. 1 this figure shows a block diagram of one possible and non-limiting example system in which the example embodiments may be practiced.
  • a user equipment (UE) 110 is in wireless communication with a wireless network 100 .
  • a UE is a wireless, typically mobile device that can access a wireless network.
  • the UE 110 includes one or more processors 120 , one or more memories 125 , and one or more transceivers 130 interconnected through one or more buses 127 .
  • Each of the one or more transceivers 130 includes a receiver, Rx, 132 and a transmitter, Tx, 133 .
  • the one or more buses 127 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, and the like.
  • the one or more transceivers 130 are connected to one or more antennas 128 .
  • the one or more memories 125 include computer program code 123 .
  • the UE 110 includes a signaling module 140 , comprising one of or both parts 140 - 1 and/or 140 - 2 , which may be implemented in a number of ways.
  • the signaling module 140 may be implemented in hardware as signaling module 140 - 1 , such as being implemented as part of the one or more processors 120 .
  • the signaling module 140 - 1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array.
  • the signaling module 140 may be implemented as signaling module 140 - 2 , which is implemented as computer program code 123 and is executed by the one or more processors 120 .
  • the one or more memories 125 and the computer program code 123 may be configured to, with the one or more processors 120 , cause the user equipment 110 to perform one or more of the operations as described herein.
  • the UE 110 communicates with eNB 170 via a wireless link 111 .
  • the gNB (NR/5G Node B but possibly an evolved NodeB) 170 is a base station (e.g., for LTE, long tern evolution, or for NR, New Radio) that provides access by wireless devices such as the UE 110 to the wireless network 100 .
  • the gNB 170 includes one or more processors 152 , one or more memories 155 , one or more network interfaces (N/W I/F(s)) 161 , and one or more transceivers 160 interconnected through one or more buses 157 .
  • Each of the one or more transceivers 160 includes a receiver, Rx, 162 and a transmitter, Tx, 163 .
  • the one or more transceivers 160 are connected to one or more antennas 158 .
  • the one or more memories 155 include computer program code 153 .
  • the gNB 170 includes a report module 150 , comprising one of or both parts 150 - 1 and/or 150 - 2 , which may be implemented in a number of ways.
  • the report module 150 may be implemented in hardware as report module 150 - 1 , such as being implemented as part of the one or more processors 152 .
  • the report module 150 - 1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array.
  • the report module 150 may be implemented as report module 150 - 2 , which is implemented as computer program code 153 and is executed by the one or more processors 152 .
  • the one or more memories 155 and the computer program code 153 are configured to, with the one or more processors 152 , cause the gNB 170 to perform one or more of the operations as described herein.
  • the one or more network interfaces 161 communicate over a network such as via the links 176 and 131 .
  • Two or more gNBs 170 communicate using, e.g., link 176 .
  • the link 176 may be wired or wireless or both and may implement, e.g., an X2 interface.
  • the one or more buses 157 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like.
  • the one or more transceivers 160 may be implemented as a remote radio head (RRH) 195 , with the other elements of the gNB 170 being physically in a different location from the RRH, and the one or more buses 157 could be implemented in part as fiber optic cable to connect the other elements of the gNB 170 to the RRH 195 .
  • RRH remote radio head
  • the cell makes up part of a gNB. That is, there can be multiple cells per gNB. Each cell may contain one or multiple transmission and receiving points (TRPs).
  • TRPs transmission and receiving points
  • the wireless network 100 may include a network control element (NCE) 190 that may include MME (Mobility Management Entity)/SGW (Serving Gateway) functionality, and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the Internet).
  • the gNB 170 is coupled via a link 131 to the NCE 190 .
  • the link 131 may be implemented as, e.g., an Si interface.
  • the NCE 190 includes one or more processors 175 , one or more memories 171 , and one or more network interfaces (N/W I/F(s)) 180 , interconnected through one or more buses 185 .
  • the one or more memories 171 include computer program code 173 .
  • the one or more memories 171 and the computer program code 173 are configured to, with the one or more processors 175 , cause the NCE 190 to perform one or more operations.
  • the wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network.
  • Network virtualization involves platform virtualization, often combined with resource virtualization.
  • Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system. Note that the virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors 152 or 175 and memories 155 and 171 , and also such virtualized entities create technical effects.
  • the computer readable memories 125 , 155 , and 171 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the computer readable memories 125 , 155 , and 171 may be means for performing storage functions.
  • the processors 120 , 152 , and 175 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • the processors 120 , 152 , and 175 may be means for performing functions, such as controlling the UE 110 , gNB 170 , and other functions as described herein.
  • the various embodiments of the user equipment 110 can include, but are not limited to, cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Embodiments herein may be implemented in software (executed by one or more processors), hardware (e.g., an application specific integrated circuit), or a combination of software and hardware.
  • the software e.g., application logic, an instruction set
  • a “computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in FIG. 1 .
  • a computer-readable medium may comprise a computer-readable storage medium or other device that may be any media or means that can contain or store the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
  • LTE networks The current architecture in LTE networks is fully distributed in the radio and fully centralized in the core network.
  • the low latency requires bringing the content close to the radio which leads to local break out and multi-access edge computing (MEC).
  • 5G may use edge cloud and local cloud architecture.
  • Edge computing covers a wide range of technologies such as wireless sensor networks, mobile data acquisition, mobile signature analysis, cooperative distributed peer-to-peer ad hoc networking and processing also classifiable as local cloud/fog computing and grid/mesh computing, dew computing, mobile edge computing, cloudlet, distributed data storage and retrieval, autonomic self-healing networks, remote cloud services and augmented reality.
  • edge cloud may mean node operations to be carried out, at least partly, in a server, host or node operationally coupled to a remote radio head or base station comprising radio parts. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts. It should also be understood that the distribution of labor between core network operations and base station operations may differ from that of the LTE or even be non-existent. Some other technology advancements probably to be used are Software-Defined Networking (SDN), Big Data, and all-IP, which may change the way networks are being constructed and managed.
  • SDN Software-Defined Networking
  • Big Data Big Data
  • all-IP all-IP
  • Example embodiments may be implemented in network backhaul.
  • Example embodiments may also be implemented in relay nodes (for example, with regard to functions described herein below with respect to UE 110 ).
  • a radio network for example network 100 , may implement functionality described with respect to gNB 170 herein below.
  • FIG. 2 is an example flow diagram 200 illustrating a method in accordance with example embodiments which may be performed by an apparatus or combination of apparatus, for example, a gNB 170 and UE 110 as described herein.
  • example embodiments may include (or incorporate) a LBT mechanism used by UEs 110 /gNBs 170 to evaluate whether the radio channel is available for use. Only in case the radio channel is evaluated to be sufficiently free from interference (LBT success), the UE 110 /gNB 170 is allowed to transmit.
  • the example embodiments may include (or incorporate) both a 4-step RACH procedure and a 2-step RACH procedure. For each step of the 4-step RACH procedure, the transmission suffers the risk of LBT failure (blocking). A LBT failure will typically cause increased latency, since a targeted transmission is blocked and a new transmission opportunity is required, and the entire procedure may need to be started all over or prolonged in case one of the steps in the access chain is missing.
  • the 2-step RACH procedure only involves two steps and may reduce the impact of LBT failure by reducing the overall number of transmissions from 4 to 2. Such reduction of transmission amount also reduces the amount of needed LBT actions, and there by lowers the probability of latency. However, the 2-step RACH procedure may, in some instances, create additional (or different) issues.
  • the 2-step RACH may require a significant amount of physical channel resources for transmitting what is normally denoted “Msg1+3” (that is, a message including preamble, IMSI, RRC connection establishment cause, etc.).
  • the Msg1+3 may contain the information normally contained in the Msg1 (random access preamble) and Msg3 (UE 110 identity and additional information)).
  • Msg1 random access preamble
  • Msg3 UE 110 identity and additional information
  • multiple UEs 110 transmitting Msg1+3 at the same resource may cause a collision resulting in lost reception at the gNB 170 side. This situation may be neutralized to some extent if many resources for Msg1+3 are reserved, but on the other hand, such over-reservation may cause large system overhead. If too few resources for Msg1+3 are reserved, the probability of collision may be very high.
  • the 2-step RACH procedure cannot work normally in that scenario, since the gNB 170 loses the usage control of those RACH resources.
  • the back-off 4-step RACH procedure (or capability to perform the back-off 4-step RACH procedure) may be necessary, or required by the example embodiments (for example, as a failsafe in instances in which too many UEs 110 perform random access simultaneously).
  • the 4-step RACH procedure has been used in LTE and Rel-15 NR.
  • the details of the 4-step RACH are shown as follows.
  • gNB 170 may broadcast the configuration of preamble (Msg1) in RMSI.
  • the UE 110 obtains the configuration by receiving SSB and corresponding RMSI.
  • UE 110 may randomly select a preamble from a configured set and transmit this random access preamble (Msg1) to the gNB 170 based on the configuration (for example, configured time and frequency resources).
  • Msg1 random access preamble
  • gNB 170 may receive the preamble and respond with random access response (RAR) (Msg2).
  • RAR random access response
  • UE may obtain the RAR and transmit Msg3 based on the UL grant in the RAR.
  • gNB 170 may receive Msg3 and sends Msg4 to finish contention resolution.
  • the gNB 170 Since Msg3 is transmitted based on an UL grant, the gNB 170 has the possibility of scheduling a retransmission request through a new UL grant indicating that the UE 110 should attempt a retransmission. If any one of steps 2-4 fails due to LBT, there is a risk that the UE 110 has to re-transmit preamble again, for example, go to block 210 (step 1) or that the UE 110 has to wait longer for messages from the gNB 170 . That is, accepting higher latency for the procedure to complete.
  • FIG. 3 is an example flow diagram 300 illustrating a method in accordance with example embodiments which may be performed by an apparatus, or combination of apparatus, for example, a gNB 170 and UE 110 as described herein.
  • gNB 170 may broadcast the configuration of Msg1+3 (including legacy Msg1 and Msg3) in RMSI.
  • the UE 110 may obtain the configuration by receiving SSB and corresponding RMSI.
  • UE 110 may send Msg1+3 to the gNB 170 based on the configuration.
  • gNB 170 may receive Msg1+3 and responds with Msg2+4 (corresponding to a combination of Msg2 and Msg4, but not including the UL grant in Msg2) if it decodes Msg1+3 successfully.
  • step 2 fails, the UE 110 has to re-transmit preamble again, for example, go to step 1, or the UE 110 switches to the 4-step RACH procedure as described above with respect to FIG. 2 .
  • the example embodiments provide gNB 170 control of the collision probability on the allocated resources, and conditions that allow the UE 110 to use the secondary set of RACH resources (the 2-step RACH resources).
  • 2-step RACH procedure is only used when UE 110 is doing RRC connection re-establishment, or alternatively when instant small data payload is transmitted without established RRC connection; or 2-step RACH procedure is only valid within the timer duration configured for a UE 110 by gNB 170 ; or the configurations by gNB 170 is only applicable to a specific (set of) cell(s); or when UE 110 has traffic for scheduling on specific logical channels or logical channel groups.
  • the example embodiments overcome the disadvantage of the 2-step RACH (large message size and high collision) and take the advantage of it (fast access), in particular refraining from using (restricting) 2-step size RACH during initial access (and instead using 4-step RACH procedure during initial access), but using the 2-step RACH procedure (for example, as described with respect to FIG. 3 ) in response to particular triggers, for example, during RRC connection re-establishment.
  • the example embodiments may have gNB 170 control the collision probability by determining how many UEs 110 can use 2-step RACH procedure and for how long a duration the UEs 110 may use the 2-step RACH procedure, and configure UE 110 with such configurations via RRC signalling.
  • FIG. 4 is an example flow diagram 400 illustrating a method in accordance with example embodiments which may be performed by an apparatus, or combination of apparatus, for example, a gNB 170 and UE 110 as described herein.
  • the example embodiments provide a gNB 170 controlled approach for a hybrid RACH procedure, which may combine the advantage of both the 4-step RACH procedure (as described with respect to FIGS. 2 ) and 2-step RACH procedure (as described with respect to FIG. 3 ), while at the same time providing the gNB 170 control of the amount of resources allocated to a selected subset of UEs 110 .
  • the example embodiments provide a mechanism for gNB 170 control of which UEs 110 may use 2-step RACH procedure, while at the same time allowing the gNB 170 (for example, some) control of the collision probability on the allocated resources.
  • all UEs 110 may use the 4-step RACH procedure (as described above with respect to FIG. 2 ).
  • gNB 170 and UE 110 may (for example, upon re-establishing the RRC connection) determine that the UE 110 is eligible for low latency access to the cell. According to an example embodiment, this determination (gNB 170 and UE 110 determining that UE 110 is eligible for low latency access to the cell) should be established prior to the UE 110 exiting the RRC connected mode (that is, before entering IDLE mode or RRC INACTIVE mode). In further example embodiments, other modes may be implemented, for example, radio link recovery or device timing recovery may also be part of the mechanisms.
  • the request (for access) may come from the UE 110 side (for example, RRC or MAC based request from UE 110 ).
  • the gNB 170 may decide to assign UE 110 to low latency access due to traffic class.
  • the gNB 170 may receive configuration from core network to assign UE 110 for low latency access.
  • gNB 170 may provide a configuration to the UE 110 for using 2-step RACH for either RRC connection re-establishment or instant small data payload transmission without established RRC connection which contains one or more of the following: a) Configuration of resources to use; b) Associated preamble set to use; c) Associated user connection ID; d) Power ramping rules for Msg1 and Msg3 transmissions (may have different rules for the power ramping); e) Configuration of a set of cells that have this configuration available.
  • the configuration may be provided separately for each cell; f) Configuration of an amount of time that the resources are reserved for this UE 110 ; g) Association of which logical channels or logical channel groups are allowed to trigger a 2-step RACH procedure (if needed); h)
  • the gNB 170 may provide configurations via UE-specific higher layer signalling (for example, RRC signalling or MAC signalling or a combination of the two).
  • the resources may be in time domain (defined as a pattern, periodicity or other way of indicating time-wise allocation of resources).
  • the resources may be in the frequency domain (like specific PRBs to use, selected interlaces to use, etc.).
  • the resources may be in the code domain (like OCC, cyclic shift, etc.).
  • Associated user connection ID this may be (for example, in the form of RNTI) used when accessing the cell when using 2-step RACH resources. Such user connection ID may be needed if the UE 110 has lost the RRC connection to the cell.
  • the configuration of time availability may be depending on either absolute time or relative time (for instance as an elapsed time after last connection, elapsed time after RRC release signalling, elapsed time after the configuration was received, elapsed time since the configuration was renewed, etc.).
  • the gNB 170 may have a possibility (for example, a capability) for indicating extension of time resources for configured UEs 110 via system broadcast signalling.
  • UE 110 may, based upon detection of a predetermined trigger provided by the gNB 170 (for example, upon losing the connection to the gNB 170 ), perform 2-step RACH procedure based on configurations provided by the gNB 170 in case the UE 110 has traffic arriving for the associated logical channel or logical channel groups, or it receives paging from the gNB 170 .
  • the gNB 170 may configure a set of triggers that allow for use the configured 2-step RACH resources.
  • the triggers for the 2-step RACH resources may include traffic for logical channels. Other triggers may include “PDCCH Order” or “paging message”.
  • a PDCCH order is a special command that is used to indicate from the gNB 170 to the UE 110 that a RACH procedure should be initiated. This procedure is used for UEs that are in RRC connected mode, but does no longer have a suitable timing relation between the UE 110 and the gNB 170 . The definition of suitable timing relation is derived based on the time elapsed since the UE 110 and the gNB 170 last had an exchange of messages on the physical layer.
  • a “paging message” is a signal that is broadcast from the gNB 170 to the entire cell. The paging message contains an indication that a UE 110 should establish connection to gNB 170 .
  • the indication is normally based on a unique identification of the UE 110 , for instance through the IMSI (International Mobile Subscriber Identity).
  • IMSI International Mobile Subscriber Identity
  • Such paging message is normally used to establish connection between the gNB 170 and the UE 110 when the UE 110 is in either IDLE mode or RRC INACTIVE mode.
  • UE 110 may default to normal 4-step RACH procedure based on predetermined triggers for defaulting to 4-step RACH procedure, for example, in case it has traffic arriving that is not in the configured set of logical channels or logical channel groups.
  • the gNB 170 may have configured the selected UEs 110 such that there is contention free access during step 4 (block 440 ), and the UE 110 may have access to the gNB 170 (or a set of gNBs 170 ) that allows for shorter access time.
  • targeted UEs 110 may not be associated to the serving cell, and the example embodiments may be applied to the random access procedure.
  • FIG. 5 is an example flow diagram 500 illustrating a method in accordance with example embodiments which may be performed by an apparatus.
  • the example as described with respect to FIG. 5 may provide a capability for a device (for example, UE 110 ) to have access to multiple ways of performing random access procedure.
  • gNB 170 may configure, through broadcast signaling, UE 110 with a first way (for example, mode) of performing random access procedure.
  • gNB 170 may configure, through device specific signaling, UE 110 with a second way (for example, mode) of performing random access procedure.
  • gNB 170 may limit an availability of the second mode of performing random access procedure.
  • the limiting may consist of (the second way of performing random access procedure) only being available a duration of time after last connection to connected cell.
  • the limiting may consist of only being applicable to a specific (set of) cell(s).
  • the limiting may consist of a device having traffic for scheduling on specific logical channels or logical channel groups.
  • a technical effect of one or more of the example embodiments disclosed herein is to provide a mechanism for gNB 170 control of which UEs 110 may use 2-step RACH procedure, while at the same time allowing the gNB 170 some control of the collision probability on the allocated resources.
  • An example embodiment may provide a method comprising configuring, by a base station, a device with a first mode of performing random access procedure; configuring the device with a second mode of performing random access procedure, wherein the device is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and configuring an availability of the second mode of performing random access procedure.
  • the first mode of performing random access procedure comprises a 4-step RACH procedure.
  • the second mode of performing random access procedure comprises a 2-step RACH procedure.
  • configuring the availability of the second mode of performing random access procedure further comprises configuring the second mode of performing random access procedure available for a predetermined duration of time after last connection to a connected cell.
  • configuring the availability of the second mode of performing random access procedure further comprises configuring the device with a predetermined duration of time that at least one resource is available for the device.
  • configuring the availability of the second mode of performing random access procedure further comprises configuring the second mode of performing random access procedure applicable to at least one specific cell.
  • configuring the availability of the second mode of performing random access procedure further comprises scheduling traffic on at least one of a specific logical channel or a logical channel group.
  • configuring the availability of the second mode of performing random access procedure further comprises configuring the availability of the second mode based on a collision probability on at least one allocated resource.
  • configuring the device with the second mode of performing random access procedure further comprises: providing an associated user connection identifier to use when accessing the base station using resources associated with the second mode of performing random access procedure.
  • configuring the device with the first mode of performing random access procedure further comprises configuring the device through broadcast signaling.
  • configuring the device with the second mode of performing random access procedure further comprises configuring the device through device specific signalling.
  • An example embodiment may be provided in an apparatus comprising means for configuring a device with a first mode of performing random access procedure; means for configuring the device with a second mode of performing random access procedure, wherein the device is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and means for configuring an availability of the second mode of performing random access procedure.
  • the first mode of performing random access procedure comprises a 4-step RACH procedure.
  • the second mode of performing random access procedure comprises a 2-step RACH procedure.
  • the means for configuring the availability of the second mode of performing random access procedure further comprises means for making the second mode of performing random access procedure only available for a predetermined duration of time after last connection to a connected cell.
  • the means for configuring the availability of the second mode of performing random access procedure further comprises means for making the second mode of performing random access procedure applicable to only at least one specific cell.
  • the means for configuring the availability of the second mode of performing random access procedure further comprises means for scheduling traffic on at least one of a specific logical channel or a logical channel group.
  • the means for configuring the device with a first mode of performing random access procedure further comprises means for configuring the device through broadcast signalling.
  • An example embodiment may provide a method comprising receiving, at a device, configuration of a first mode of performing random access procedure from a base station; receiving configuration of second mode of performing random access procedure, wherein the device is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and receiving configuration of an availability of the second mode of performing random access procedure.
  • the first mode of performing random access procedure comprises a 4-step RACH procedure.
  • the second mode of performing random access procedure comprises a 2-step RACH procedure.
  • receiving configuration of the availability of the second mode of performing random access procedure further comprises receiving configuration of the second mode of performing random access procedure to be available for a predetermined duration of time after last connection to a connected cell.
  • receiving configuration of the availability of the second mode of performing random access procedure further comprises configuring the device with a predetermined duration of time that at least one resource is available for the device.
  • receiving configuration of the availability of the second mode of performing random access procedure further comprises configuring the second mode of performing random access procedure applicable to at least one specific cell.
  • receiving configuration of the availability of the second mode of performing random access procedure further comprises scheduling traffic on at least one of a specific logical channel or a logical channel group.
  • receiving configuration of the availability of the second mode of performing random access procedure further comprises configuring the availability of the second mode based on a collision probability on at least one allocated resource.
  • receiving configuration of, through device specific signaling, the device with the second mode of performing random access procedure further comprises receiving configuration of resources for the device to use from at least one of time domain resources, frequency domain resources and code domain resources.
  • An example embodiment may be provided in an apparatus comprising means for receiving, at a device, configuration of a first mode of performing random access procedure from a base station; means for receiving configuration of second mode of performing random access procedure, wherein the device is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and means for configuring an availability of the second mode of performing random access procedure.
  • An example embodiment may be provided in an apparatus comprising at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to: configure a device with a first mode of performing random access procedure; configure the device with a second mode of performing random access procedure, wherein the device is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and control an availability of the second mode of performing random access procedure.
  • An example embodiment may be provided in an apparatus comprising at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to: perform: receive configuration of a first mode of performing random access procedure from a base station; receive configuration of a second mode of performing random access procedure, wherein the apparatus is configured to access either the first mode of performing random access procedure or the second mode of performing random access procedure; and control an availability of the second mode of performing random access procedure.
  • Embodiments herein may be implemented in software (executed by one or more processors), hardware (e.g., an application specific integrated circuit), or a combination of software and hardware.
  • the software e.g., application logic, an instruction set
  • a “computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in FIG. 1 .
  • a computer-readable medium may comprise a computer-readable storage medium (e.g., memories 125 , 155 , 171 or other device) that may be any media or means that can contain, store, and/or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
  • a computer-readable storage medium does not comprise propagating signals.
  • the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined.
  • the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto. While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • Embodiments may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process.
  • Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.
  • connection means any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are “connected” or “coupled” together.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as several non-limiting and non-exhaustive examples.

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